Equine Herpes Myeloencephalopathy (EHM) Updates:

EHV-1 Quarantines Released

November 20, 2018: The quarantine has been released on the index horse (that displayed neurologic signs) following two negative EHV-1 tests. No additional cases were detected and the quarantine has also been released on all exposed horses. There are no active EHV-1 quarantines in California.

November 17: The quarantine on exposed horses has been released with no additional cases identified. The index horse which displayed neurologic signs remains under quarantine and isolated offsite.  This index horse has had one negative test and will be tested on Monday November 19, 2018. If those results are negative she will be released from quarantine. 

November 8: NO NEW CASES. Five exposed horses have been identified and quarantined; their temperatures will be checked twice a day. Enhanced biosecurity measures have been implemented and CDFA continues to monitor the situation.  

November 7, 2018: A 24 year old Arabian mare, originating from a San Mateo County facility, displaying neurologic signs has been confirmed positive for Equine Herpesvirus Myeloencephalopathy. The mare was removed from the property and placed in isolation and quarantined. CDFA is investigating to identify exposed horses which will be monitored for clinical signs and temperatures taken twice daily. Any horse displaying a fever or compatible clinical signs will be tested. CDFA will continue to monitor the situation and post new information as it becomes available.